btrfs: remove unused function btrfs_assert()

Apparently looks like ASSERT does the same intended job,
as intended btrfs_assert().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>